/**
 * Moondance UML modeling tool
 * 
 * This program is free software; you can redistribute it and
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package ro.pub.cs.se.moondance.editpolicy;

import org.eclipse.gef.commands.Command;
import org.eclipse.gef.editpolicies.ComponentEditPolicy;
import org.eclipse.gef.requests.GroupRequest;

import ro.pub.cs.se.moondance.command.AttributeDeleteCommand;
import ro.pub.cs.se.moondance.command.ClassDeleteCommand;
import ro.pub.cs.se.moondance.command.OperationDeleteCommand;
import ro.pub.cs.se.moondance.command.PackageDeleteCommand;
import ro.pub.cs.se.moondance.editpart.TreeEditPart;
import ro.pub.cs.se.moondance.model.ClassFunction;
import ro.pub.cs.se.moondance.model.ClassVariable;
import ro.pub.cs.se.moondance.model.ModelElement;
import ro.pub.cs.se.moondance.model.UMLBaseClass;
import ro.pub.cs.se.moondance.model.UMLDiagram;
import ro.pub.cs.se.moondance.model.UMLPackage;

/**
 * This edit policy enables the removal of a UML instance from its container.
 * 
 * @see UMLEditPart#createEditPolicies()
 * @see TreeEditPart#createEditPolicies()
 */
public class UMLComponentEditPolicy extends ComponentEditPolicy {

	/*
	 * (non-Javadoc)
	 * 
	 * @see
	 * org.eclipse.gef.editpolicies.ComponentEditPolicy#createDeleteCommand(
	 * org.eclipse.gef.requests.GroupRequest)
	 */
	protected Command createDeleteCommand(GroupRequest deleteRequest) {
		Object parent = getHost().getParent().getModel();
		Object child = getHost().getModel();
		if (parent instanceof UMLDiagram && child instanceof UMLBaseClass)
			return new ClassDeleteCommand((ModelElement) parent,
					(UMLBaseClass) child);
		else if (parent instanceof UMLBaseClass
				&& child instanceof ClassVariable)
			return new AttributeDeleteCommand((UMLBaseClass) parent,
					(ClassVariable) child);
		else if (parent instanceof UMLBaseClass
				&& child instanceof ClassFunction)
			return new OperationDeleteCommand((UMLBaseClass) parent,
					(ClassFunction) child);
		else if (parent instanceof UMLDiagram && child instanceof UMLPackage)
			return new PackageDeleteCommand((ModelElement) parent,
					(UMLPackage) child);

		return super.createDeleteCommand(deleteRequest);
	}
}
